F. Combes, Nguyen-Q-Rieu, G. WlodarczakObservatoire de Paris (France)Université de Lille (France) Abstract: Because of its central biological significance,
glycine has extensively been searched for in the 1980s, after the
laboratory determination of its millimeter-wave spectrum in 1978. Using the
30m IRAM telescope, we have recently carried out high sensitivity
observations to search for both conformers I and II of glycine in several
spectral regions at 3 mm (around 101 GHz, 107 GHz, 111 GHz), at 2 mm (around
136 GHz and 144 GHz), and at 1.4 mm (around 217 GHz and 223 GHz) with a
bandwidth of 512 MHz. The targets were Orion and Sagittarius-B2.
We covered spectral regions which included
98 expected lines of glycine: some did show some signal at various
levels (10mK-1K), but many were not detected, while comparable signals
are expected. Since the level of confusion is reached in Orion,
we believe that glycine is below the confusion limit, and will
be impossible to detect in this source, as well as other complex
molecules of similar or lower abundance ().
During these observations, we detected 334 lines in Orion, 157 of which are
unidentified.